Garage door opener/closer won't close in bright sun

I've been helping my parents with a second home they're prepping for rent, but there are all these little things they're trying to fix up. But the thing that's pretty maddening is the garage door opener. I'm not sure when it was installed, but I think my mother ordered the cheapest possible equipment. It's some brand I've never heard of called "MARTIN" - or at least that's what's on the remote, which uses a single A23 battery.

The issue is the electric eye sensor, which is right in the...

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